状语从句之“原因状语从句”（用例句的方式阐述引导词because等）
一、原因状语从句是什么？
（1）百度百科的解释是：指在句中用来说明主句原因的从句。
（2）引导原因状语从句的从属连词有because[因为], as[由于], since[既然], now(that)[既然], when[既然], seeing (that) [由于，鉴于], considering (that)[考虑到], for[为], given (that) [考虑到]等。
二、常用的原因状语从句引导词有哪些？
（1）最常见的有because，since和as。
（2）because表示原因时语气最强，而as和since表达的原因多是为人们所知的。
例句1->
①l couldn"t be mad at him because I liked him too much.［由于太喜欢他了，我不忍对其发火。］
②I didn"t know that she had been married，since she seldom talked about herself.［由于她很少谈论自己的情况，我并不知道她已结婚。］
③As no puma had been reported missing from any zoo in the country，this one must have been in the possession of a private collector.［由于全国没有任何一家动物园报告丢了美洲狮，所以那只美洲狮肯定是某位私人收藏家的。］
（3）in that（因为）
->说明为什么主句所表达的陈述是确实的
例句2->
①I"m in a difficult situation in that I have been offered two jobs and they both sound intersting.［我之所以为难，是因为我有两份工作可选择，并且它们看上去都还不错。］
②He failed to arrive at the airport punctually in that he had suffered a terrible traffic jam.［他之所以没能准时到达机场是因为他遇到了严重的塞车。］
（4）其他引导词组
->now that[既然]，seeing that[由于，鉴于]，considering that[考虑到]，not that...but that...等
例句3->
①Now that a tunnel has been built through the mountains，the pass is less dangerous.［由于一条穿山隧道已经开通，翻越山口已不那么危险了。］
②He soon discovered how much faster he could travel now that he was alone.［由于是只身一人，他很快便发现他可以比先前走得快得多。］
③Seeing that you"re the guest on this little trip，I won"t tell you what I think of your behavior last night.［鉴于你是这次短途旅行的客人，我就不再评说你昨晚的行为了。］
④They did the job quite well considering（that）they had no experience.［考虑到他们没有任何的经验，这份工作他们算做得相当不错了。］
⑤It is not that I dislike the task but that I am unequal to it.［不是因为我不喜欢这个任务，而是由于我确实不堪此任。］
（5）特别提醒：for也表示原因，但它是并列连词，引导的是表示原因的并列句，并非从句（现实中，许多人把它也看作原因状语从句），只能放在后面，并用逗号隔开。
例句4->
①We never see Henry these days，for Henry has grown fat and lazy.［近些日子以来，我们之所以从未见到亨利，是因为他现在变得又胖又懒。］
②Because it was raining，he didn"t go out for the picnic.（不能用for）［因为下雨，他就没去野餐。］
③As the evidence began to accumulate，experts（from the zoo）felt obliged to investigate，for the descriptions（given by people）（who claimed to have seen the puma）were extraordinarily similar.［ 随着证据越来越多，动物园的专家们感到有必要进行一番调查，因为凡是声称见到过美洲狮的人所给出的描述都出奇地相似。］
再谈“状语从句”之目的状语从句，通常由这两个词组来引导
再谈“状语从句”之结果状语从句，通常由哪两个词组来引导用
再谈“状语从句”之条件状语从句，通常由if，unless等引导
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